RTSP proxying with Caddy

Question

Problem

I'm using MediaMTX to proxy an RTSP stream via a WebRTC endpoint. The MediaMTX server exposes a WebRTC endpoint on port 8889.

I need to run the MediaMTX server on a VPS which is using Caddy as a reverse proxy and a static server to serve some other files. I want to reverse proxy a certain path to port 8889 but I get application/x-unknown-filetype errors in the frontend.

Current setup

• Caddyfile

    my-server.com {
        handle_path /relay/* {
            @denied not remote_ip forwarded private_ranges
            abort @denied
  
            reverse_proxy :8889
        }
    }
  

• Usage in frontend

  <iframe src="https://my-server.com/relay/$cameraID"></iframe>
  

Potential causes/solutions

• After a little digging, I found out that this might be happening because Caddy doesn't support raw TCP traffic. caddy-l4 might be of help.
• Right now, I'm using MediaMTX to convert RTSP ➡ WebRTC and expose it to the frontend. I might try with other methods like HLS.